222 



THE NORMAL AGE CLASSES. 



The next oldest coupe contains 



Underwood = 19 years old 



Overwood = 99, 79, 59, 39 and 19 years old. 



The youngest coupe contains 

 Underwood = 1 year old 

 Overwood = 81, 61, 41, 21 and 1 years old. 



60TEET 



IrOFEEST 



ctovi-H a 



Fig. 47. 



The appended figure 47 illustrates the distribution of the 

 several age gradations over the area. 



